package chai.ning.train_9;

public class Circle extends Shape {
	protected double radius;
	
	public Circle() {
		this.type = "圆" ;
	}
	public void calculate() {
		this.area = Math.PI * Math.pow(radius, 2); 
	}
	public void description() {
		System.out.println(this.type + "的半径：" + this.radius );
		show();
	}

}
